Put a "Shell" modifier on it with 3 segments to give it thickness. Smooth all 3 parts. Position the glass in the guage. It would be a good idea to group the three parts together. If you want, you can also make the guage needle but you don't really need to. So we have one guage done.

Position the guage in the dashboard behind the sterring wheel and then duplicate it twice. Position the three guages as shown.

There are a bunch of knobs on either side of the guages. These are easily made using splines and lathes. Create splines similar to the ones in the picture and then add "Lathe" modifiers to all of them.